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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6377c96fa2f61c852a5ad44205a61a5affeaeeb0eb0a8aa818d80d197e8ac31f' 
  AND token = '4tWabcKFHV3Waa0wun80AGQV32jvy5mLC0FIuo/j140=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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