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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bab0ff8952179ad92b7195a8fdbd10ec3c28c61ea40f6cb5500ee3a6f29dc4f' 
  AND token = 'sXJ3FlR1rvM90L8uUkKumO14iPwPa/oZxlaU8vjCiQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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