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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2d7ec91b913c556df922d3ce1c41c7fc5904238ac055bcd98774106a68ae82' 
  AND token = '+bfqwIfldt5O0W/TQX8ByxOoA9Wo5ImhrTcbu85hEaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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