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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ff38b9ed9a534c79f94d1c1e7ae13e494fc50e5721af9efae5ca0444ab6912' 
  AND token = 'KxiaJgbdSS6JbYDBkwk3nu6jPydXMCKPpnms3Ektvrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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