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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c166b6c46b22329f286c7acfbe57820f9584a8069b5f2b9b6e6615c634da33' 
  AND token = '5ZUBJaVIbfjbANRdjZ2GrV+nsc64z+SWXwbxSBo2uKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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