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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c729e284cff1870efb8b72c52ef9bd7a9a006d34bc21129b74a9d2c68e5af07e' 
  AND token = 'TXVSBTDw4jfV2sEVW5teBBqcuSTZ78fS38BOV7XmtPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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