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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb91739d5e34eaa60e5d08df3e88c82a717e6bc3d0375cd91c2697bac0b83479' 
  AND token = '33q7/l1+K/fHmeeV7uQ7QSiBrUNtmnzqej+0oB6sePY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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