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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b748f0fa72fd561ae967ed1138dd993d9830e102377f0b5bcac81a6ac0d005' 
  AND token = 'DdsyH7blCIIN3IBNcFP/GXZPkY186jnN8Yn8f2TrUMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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