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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6c45c1f77e9999a638c604151329ae646852171629c0d9abb0b0203efe84a1' 
  AND token = 'dZuHLf6sHs36ZcgSh2W6pCQhF4xxKkKNiZRT0WoQcHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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