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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cb4e0ab1bf1241bb3bdd67cdebe37b496769a4218b41a88f2622dd4b90bdf3' 
  AND token = '5riWMl30kSRxrTN4vlINRsNF0XQDHNs30+BFTeI09Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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