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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a926563abc4e04e3b0cbaaa9402db573783a848e13e070f6b4ca95b677b83b1' 
  AND token = '2VCQpX2PvBoTPa/NLWTD4ZAnqOr9HaAA+vV2dYNEqZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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