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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fe318a55bcc76b9aba83317e6c9bdc6dad790f780cc4d935ab675fc72f6716' 
  AND token = 'kQnZtFe+FtyKvLt6BPUWr7lL1s1Sof/JiE11BRrR4rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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