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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f689d129ea8b8b06680f587824dd0608f1e6dcd0244801721426d0b7bc6918' 
  AND token = 'QzOLjQmJHR54PdG4Yd+ShzP4RxYlJ8G0i/v+lHSNkgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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