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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba7ef665aff0999104407086bcd06cecf89d436e1283ccdade40bd0ecce25ad' 
  AND token = 'UkdRWAsBRH+biR34LBwkGwrTdHQPZ7c1e5OvCAjtcEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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