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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f2c25b73225703cc93bbbde636eec17aaed460fc8104fa45d934df05e26430' 
  AND token = 'G+uvEpKbrvFjWbCX5jq8BpbElrMt6zl0ZfAa9QdMvF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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