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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea7713d3beef5f154958b67ef34db4a5049df4ead0946e2e723ae9b52fb76e4' 
  AND token = '70xKG4Sz2xlt/fqLrF21oOfQqZ7n1ZfPWD20qzWKh0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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