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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bcca9e298735115dc8d83c2701d569639f76251dd7f670de017d8588ce85d9' 
  AND token = 'w7QUii/xGVXNceJA/YMSoiTc30GYhiwMT4+I7apJqu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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