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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d6f16d1761f77eb74290a233b0959afb861a66c52d7baaf08ff3caae67fdb2' 
  AND token = 'L7dDYE3j6ZnyYXdLemhzdIeQohcFCVYXcVrDzB7mKf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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