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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c85174654b7fe788d0186ff231ea80361dabb1f034501cfb704d5b9864685b1' 
  AND token = 'aSi8Iys0IfL2yoKPxjgd/12gR8n5gbC+WZkoybMfn5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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