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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697719b50338891005252f8aa1a11f1f65ecc0854b9f47256a4b318d3c200cbf' 
  AND token = 'ofzt0p6t3pi+SgFJEDCpqeuQFatxco/S0+jcamnPGOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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