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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0e8d4bdc9753f30c6afa93fbc52d5351ac9d4edeac382215f4c07c126ad6d5' 
  AND token = 'gHNRSecMhapi3yYlbKIEv5IKkPFit+1AnBkpbRfc4vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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