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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29400010b1866f68aa0e2920106fad1973243cb515f803a6aeceb5e7c7e385d9' 
  AND token = '/2nuMKwLCTUs+7k6BZtLqNDfR6bKDN0Q3+prXLKvSN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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