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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf236b6b28eccbe1b540ae064d4f1d49b0bfa8fa326642fa28cd38397cc7f2fb' 
  AND token = '/CZt0l3oPGF8oxp4QKbzAxAo2j/hDBvz3q3GlcKafDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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