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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa14047964fce0b43bceefb93c2f3a09f8d9ebb6d18197f9ca16fb5de05d41d7' 
  AND token = 'u2dQxy+GiyofF8A89QC4LrgXgAQ7TODUlg278bTSQq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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