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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0bf768a1df382b09c9a7728294e8899fea390057c2c0f3ee57bc9fb5d84f94' 
  AND token = 'gqk949tWRGJZv7dcCtj4Q4AZfJZgNFdVyx3TyI717Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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