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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27af91df5f19e9ebf957fef140e0221f37e3688c340043e09764e2bcd14e91e' 
  AND token = 'bEGZ9nkoWrqq/ZdjT1tm0/fkR5BRRlyiWwunbiq5AaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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