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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e05833c3f3094664c41f95d97242e38ed6a32a9b44a1aa7afb8b51576b3691' 
  AND token = 'bLAwUKRfBIQN7Ayv2YNjZH3BlMrKqMMKy5MR8iPQl+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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