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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d5aa1f427199418534c8beae594c95803e95d6aa36736e71ae101349c88bab' 
  AND token = 'wdl8Hs5BG2cMzyDm8PnJO4uMCY48Btpn4lD0bnTS1es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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