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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb964643c45e9244e316efbac5322c5f95439eab3bae9632ba996421e7b2d739' 
  AND token = '+2rNjW/e/aMoyiTIXpaVbUC4iyBe2uiO7NELL3b3Abw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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