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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bba44d331f2ecd3a5b3fbe34db3318dbd939c0f0c698f3c38ac9ca1fe54694' 
  AND token = '/xs0ryMLgzQRE289PtMRJlT0sRH/BBeZphsAWlx1EHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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