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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f812665936b936ae680e988d2dd9d067b55956f60dbf7d0eb6714e4cd8a121db' 
  AND token = 'S1jmXqWzHtlQb5yIKUeeQz5ayI2SGAbA+jYd+UWbsog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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