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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38bb4ef2164b0ca9a2e5e47ffcbeb8cd1cff806a5c322f28d3879f5dde31800b' 
  AND token = '/MGccPFKdZOL1Wlxibehc6H76fCih9gSKtADV45VCIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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