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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024a7763eb0b57c6fa583aa4c8a2ea4226767a724c840041f7cdb87b9fad03be' 
  AND token = 'AANw95ZwkurvlTRII8rE2OCYAVIE1S/dTMi6lLCbP+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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