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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0787cded031da223295ec48ba028e5af2b25d70c23bbced464e7c3d6b4dbf3d' 
  AND token = 'BI/S86b/mz45TNqikVGs6cDQyaoXfG3bUygz42ddfkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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