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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0001f9019d63f21c5aca7b860ed28dd331e2a74c3fd30e7dc4c89d85b7d6537' 
  AND token = 'U4aNtU70NQuyUpmGKx0DnhoGCyDdKf9usvDFDPwwR1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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