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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d4578cabcc6f7801eaf59a66a9e542c7fbbdf6e9ff7c86ca17400402220846' 
  AND token = 's5n2WQC0eCPpdHEiRasp9CCsw/Kx2b9wGm4aB4gOT+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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