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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e0921b4c20425cb88f54fed7944ec2ec3b9bb4b234154d69db5e8ad1ee951f' 
  AND token = 'V2yZnBIGXKyVCNd27pjOXNZx0dVOKo3tmXpqdKeQocs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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