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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c18a836787beb6234498f2d8ffc9475f954b88c23bacb0e07e875550a267704' 
  AND token = 'sFw0x1hO8nadcBv1pH31RbUnwoefWdm8tJufkg5D4mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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