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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c33b6107a1ba25e9a516a47701a35b1b2c027f1fabeef10ca843fdcef609fe0' 
  AND token = 'WK2fvHb8jFQ9jS/CsNyEmVoNDncxTdtNBWMExdaJbjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}