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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcf929fb1fb56c91537fd98981df5fa96a9a8e9cfb47ac0bce489a9bc1b9071' 
  AND token = 'i2oLldE833j9f2Lu6nOdfZimh+x9TWviQDmG9/8y9KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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