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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a1bbde577d94392d9dbcee5d365d963dc0f2dd2a7971090530dee6fc85f399' 
  AND token = '1Moq+Ow5oGoI1IzwTJvdECTeAEG2VW+DAirTRMnFNVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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