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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7298a5332ca1ecf68e3adca409e73e852a0f488f1d4f84089096a697ec1e64e' 
  AND token = 'Csmxnf40L0oe4sQp1wmXS+I1qKeHCJwisxVjvxKJPq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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