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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29d0814043bbb71e41612365cceda6ffdc15ad55b9a5062e0d41411c2051553' 
  AND token = 'B8tC+QlURnkTrR0e9dAesNcZTWPYBArKeSBlpg4eYJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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