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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb10ce0f5ff2649afce29f21d5f867edd8c6f76ea0fd5606f448d8a7ac35c5bd' 
  AND token = 'OzbGm+t4TqzZrX6knmaqytkaVRcLg9WeZkFE1ObqcDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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