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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8578ba3493d18312e36bc47d5be122c738e712ff082e91a63ae8a5e48f79b439' 
  AND token = 'NGMJZisGphnMGyWo9FvW0ZYMtvoxeF4OV/K6bTPTl2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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