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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b626a367fd5a93722e6c5b5567489a1d01da64c03b3e4b905e3178ae4cf980' 
  AND token = '2J6AtRjlmWUCAywk33R2TEOL5NxM8nI+CRQiTSY0obc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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