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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89130c30d600a02ea5e58efd398d6e3679eefe90c5c09fe1a5d5cdd4858d2575' 
  AND token = 'oeAsA90E9WMsG4WGfZtKRmTQZp8iKr8oSNaIjxGBUO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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