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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cd7e7d563b914e218ec1c624e034eb0cdae3d5e19a0e1b42b24d85db60b699' 
  AND token = 'r0epK3G3aKJ6dH4+CbWYc5OWIaYuRp75pIumg15tbmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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