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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef809eff8ea5356499857cd99c4848b095e54e5a6bb955cf119718c1ebf8b522' 
  AND token = 'nj+4bV3zepM7agWgow5y/33rrjdxl1fBKHNEzdXH2Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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