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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15a02449f6fc04daa4d698ebe042d2d3bd2ecc3b93fe238f4d50e4c1c23448c' 
  AND token = 'JmoY2ksKes/6obyhT5AqkOSwo4bA55eQqby9LqMiqDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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