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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3522327acba65ff6b32cb084641f3694fed40569b6fd1e09ddde60bb05652522' 
  AND token = 'u4OBMK0tTZYS1Y3FV3/32IUzi3FIz1xt3lG2RfoMEFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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