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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da6a16e19e173d566babf4810a79676c49d1d916a91a703fa4f615f77b7ec2e' 
  AND token = '0pNoDCmQ7ts8vdx9efu1s+C2g4ECR6nUg7BR1o6GsvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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