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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f5256ee0b3e3904cf4e0847a6de43d9893f3cfd47a4220b6023e2d7e49bafb' 
  AND token = '7uIERIZFwOsVqFrm93XtIgQFJehos9vIceaNkkOsaYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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