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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432f8060c8ce8d19f20bcafaad27b22a7e5ee78093c3c712cb5bb3ab82118aa9' 
  AND token = '6eDJZ2JRBiEZDf/UVeWADeO3zaSLLrQLRfWnYLOIub0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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