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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a498097109efdd988e7791d4ca649e507b7eb059dc64a15a65cea206e9c424' 
  AND token = 'xGkiEj56a+rM99GVevEo/UWSuFrUnNmE2ipGm4sLGCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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