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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cce67b50f5210f2dea3e3a62cd01cfeacf94de3d5f74c7564612721df3743e' 
  AND token = 'GeAyhtYTg5iewR7dYf/XoH6YKsOA17LU1OMBeFTQNPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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