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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6835c8c1c94864b5ba0cc4bc4a719159c04c4c15182ee3e0012973c3814eda7a' 
  AND token = 'Cpsk3vt1Q8yD+5v6Tt2AtWdGrRN1ZpeRWKYBIvtqDjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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