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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba649484f432ad55b75fef976e2b1e33779f434a5010ab7c2f0bb9800ed7a9a' 
  AND token = 'R/j+zPEIs/2+/hbtfGEyXMsSzwto7VKQmDRLUb5wefI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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