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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031969447e5933ac98e8e3b7a4739328d019109dc9dd108a5d0d4a8e80cca342' 
  AND token = '9dpbfFDWi3S9Ra1Zk6V45P2InBD/w7G/CPBibiCpDhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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