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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fc412c5881398757bacf8fc6e8e150fc3a32b2199698abcc53cfca74458d3a' 
  AND token = 'EI1ftc1tbnyx5KsbA89WT32K6n2zVaeL3SILBPH7zeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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